Fantastic site! These wasps(?) were located at the edge of a hollowed out section of a tree in southwestern New York State. Could they be male and female American Pelecinid Wasps? I’m not positive because their coloration is somewhat different from others I have seen. Thanks.
We believe these are male Giant Ichneumons, Megarhyssa atrata. Eric Eaton writes on BugGuide: “I did some reading recently, and apparently that shovel-like appendange on the end of his abdomen allows him to mate with a female while she is still in the tree, prior to her emergence! Sometimes you will see a group of males waiting patiently for a female to emerge from a log or dead standing tree.”